Switch device for automatic telephone-exchange systems



March 20, 1928. 1,663,360

F. TRACHSEL SWITCH DEVICE FOR AUTOMATIC TELEPHONE EXCHANGE SYSTEMS Filed April 14 1927 2 Sheets-Sheet 1 n rep/70R,

March 20, 1928.

, 1,663,360 F. TRACHSEL Filed April 14 1927 2 Sheets-Sheet 2 I 7myg/ Cir Patented Mar. 20, 1928.

UNITED STATES PATENT OFFIQE.

FRITZ TBACHSEL, F BERN, SVIITZEBLANID, ASSIGNOR TO CHR. GFEL'LER AKTIEN- GESELLSCHAFT, OF BERN-BUMPLIZ, SWITZERLAND.

SWITCH DEVICE FOR AUTOIMATIC TELEPHONE-EXCHANGE SYSTEMS.

Application filed April 14, 1927, Serial No. 183,764, and in Germany April 17, 1926.

The present invention relates to a switch device in an automatic telephone exchange system provided with a selecting device arranged after a two coordinate system. In this system each subscriber has his snbscribers set, with contrivances, which by means of an electro-magnet are brought into a position of readiness so that they may be .seized and displaced by a switch member for the p urpose of closing contacts.

In the switch devices heretofore known the mentioned contrivances did not participate electrically y, k the subscribers. Generally springs were employed operating quite mechanically and transmitting tl movement on contact springs. According to the present invention said springs are electrical conductors which are making contact with the switch member which likewise an electrical conductor.

T annexed drawing represents as far as it is necessary an automatic telephone exchange system having the above-mentioned. features.

Fig. l is a perspective view of the principal parts of a subscribers set of said system and Figs. 2, 3 and 4 show details 01": these parts anl a switch member cooperating with the same;

Fig. 5 an inverted perspective view showing certain details of the sliding rods mentioned herein;

Fig. (3 is a further View of the same purpose and Fig. 7 nections.

All parts of the SllbSCl'ilOQlfS set are mounted on a stirrup-shaped bracket B provided with bent-oil fastening lugs L. The subscribers magnet M is located alongside of the left-hand leg of said bracket and its rectangular-lay bent armature Art is pivotally held at the outer edge of an intermediate bracketleg T fixed to the bracket B. This additional bracket leg carries also the contact set p which is held insulated and is controlled by the movements of the armature so as to cause the contact of two blades of said set whenever the armature is attracted.

Small angular brackets 71? are riveted into cut-outs of the stirrup-bracket and insulated flat-springs do are fastened thereto. These springs are directly connected. by wires 6, e to the bridging-relay set, as shown in the is a diagram of the electrical concoponding application 101,516 filed April 12, 1926. They a leaning sid ways against the insulated carrier pins M M mounted on the hollow rods Zu, Z'uF and are extended into the reach of the blades Sb" representing the switch member. The rod 744- hinged at one end to the armature An and slidingly held at its other end in the right hand leg of the stirrup-bracket. The rod Z-zfi is slidingly held at its hollow left-hand end on a pin 9 fast to the bracket-leg T and at its other end in the right-hand leg of the bracket 1). hen the armature is attracted it moves the rod .Za against the etlect of the contact springs (Zn and this movement brings the springs do into the reach of the already mentioned blades St which represent here the second switch members, as shown in the copending application 101,516. The blades St are intended to displace the contacts, they are constituted of a plurality of insulated lamellas kept together by means of cross bolts Q.

As represented in Figures 3 and 4 the blades are provided with sideways bent ears ll. These ears are staggered and will seize the bridging contacts (in at the beginning of the upward movement of the blades either at once when the subscriber of the respective set is calling or only then when the blade has moved upwards after several efiected switch movements and when the desired subscriber has to be switched out. Thus the bridging contacts are seized here directly by the blades and are displaced while these blades are continuing their movement. This movement will cause a displacement of the rod Z14 by means of the carrier pins Mi and the displacement will allow to operate the contact set V by means of the dog Au By means of this contact set the circuit of the subscribers magnet appertaining to the contacting set will be broken and thereby the armature as well as the rod Zu will again retake their initial position.

According to Figures 5 and 6 the sliding rods Zn and Zn are mounted between one of the two legs oi the stirrup-shaped bracket B and an intermediate leg T is riveted to said bracket. To the end of this intermedi ate leg the angular armature An is pivotally attached by means oi the two screws a and one end of the sliding rod Z14 is connected to the end of the angular armature at i) so that when it is moved by the rocking armature it Will always maintain its parallelism with the rod Zu (Fig. 6). Said armature carries a knob 0 which when the armatinre gets attracted will push one blade oil the contact set 0 against the other blade so that the contact is established at d between the two blades (Fig. 6).

'ilhe end oi the other sliding rod Z10 Which is hollow is sleeved over a pin fixed to the lee 'l inside oi a cut-out of the armature. l t is siidingly guided thereby while its other end a."er crossing the leg of the bracket B carri s the insulated dog Au adapted to con )l the contact t0.

lwhat claim as new is:

and provided with insulated carrier pins one rod slidingly held at one end in a bracket leg and attached to said armature and the other rod slidingly supported in a leg of the bracket and in the intermediate leg and attached to a contact member oil. said con ct set, transverse insulated contact springs, capable o't maintaining the relief position of said armature While leaning against the pins of the first rod and capable of assui'ning a position of readiness when displaced by the first rod hinged to the armature, and electrically conducting switching blades arranged transversely to said rods, and springs near the ends of the latter and provided with sideways projecting lugs adapted to seize the ends of these springs in order to establish the contact and to displace the second rod for breaking the circuit of the magnet and restoring again the initial position.

In testimony whereof I atiix my signature. 

